OP: "So the first question, is it a risk to take a 13 year old car on a long trip?"
Short answer - yes. It's a risk to take any car on a trip, and reading HJ forums (fora?) sometimes the newer the car the bigger the risk.
I run an 04 X type 2.0d (yes, I know it's not a 'proper' Jag). Now on 168,000 miles. Serviced by a trusted indy. Last three years it did annual trips to Andorra (2,500 miles return including mountains in high summer) without fault, averaging 50+ mpg while taking advantage of 130 kmh limits.
Recently I've been doing weekly trips to East Angular (600+ return) to assist re my daughter being in hospital. Again, 50+ mpg, hasn't missed a beat, but I will confess that after many miles easy cruising it produces a cloud of smoke when red-lined. I keep this in reserve for when I'm being tail=gated, and it's worthy of a Bond film.
(Interestingly or not my son just did the same trip in his 1.2 Dacia Sandero. Driving reasonably, he got 60+ mpg).
Actually, I trust my 13 year old (properly serviced) car more than I'd probably trust a newer more highly electronicsed (is that a word?) job where one broken connection (or failed bulb?) can b***** the whole shenanigans.
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